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EN 1.7390 Steel vs. R30003 Cobalt

EN 1.7390 steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.7390 steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 16
10 to 73
Fatigue Strength, MPa 310
320 to 560
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
83
Tensile Strength: Ultimate (UTS), MPa 710
970 to 1720
Tensile Strength: Yield (Proof), MPa 480
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 260
310
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1440
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 4.3
95
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.7
8.0
Embodied Energy, MJ/kg 23
110
Embodied Water, L/kg 69
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600
600 to 2790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
32 to 57
Strength to Weight: Bending, points 23
26 to 38
Thermal Diffusivity, mm2/s 11
3.3
Thermal Shock Resistance, points 20
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.18
0 to 0.15
Chromium (Cr), % 4.0 to 6.0
19 to 21
Cobalt (Co), % 0
39 to 41
Iron (Fe), % 91.9 to 95.3
10 to 20.5
Manganese (Mn), % 0.3 to 0.8
1.5 to 2.5
Molybdenum (Mo), % 0.45 to 0.65
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.4
0 to 1.2
Sulfur (S), % 0 to 0.015
0 to 0.015